Which intake manifold

I agree with the two barrel intake. I also agree with Charlie that the 4412 is too big. That's 500 cfm. I have a 450 quick fuel four barrel on mine and I consider it pretty heavily modified. Over 10:1 compression, .465 lift 250 @ .050 duration on a 108 LSA. I think the 4412 would be too big for an engine that was much milder than that. I would look at the 318 Carter BBD two barrel. It would probably be much better suited. Maybe even the stock Super Six carburetor if it's going to be really mild.